FSCBK

Prolog  

Control Block Contents  
   FSCBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

FSCBK Control Block Content

FSCBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      FSCBK
0000    0 Dbl-Word     8 FSCUSER (0)    Userid if user has logged off.
0000    0 Signed       4 FSCVMDBK       Origin VMDBK address if user is
                                        logged on.
0004    4 Signed       4 *              Reserved for IBM use.
0008    8 Dbl-Word     8 FSCGRACE       Timestamp for grace period.
                                        FSCLOCK must be held to update
                                        this field.
0010   16 Signed       4 FSCCOUNT       Number of doublewords of free
                                        storage currently held by user
                                        for monitored control blocks.
                                        FSCLOCK must be held to update
                                        this field.
0014   20 Signed       4 FSCSTATS (0)   Limit detection status
0014   20 Bitstring    1 * (3)          Reserved for IBM use.
0017   23 Bitstring    1 FSCFLAG        Flags. Serialized with FSCLOCK.
          .1.. ....      FSCWRNG        X'40' Warning message was issued.
          ..1. ....      FSCSTOP        X'20' Virtual machine is placed
                                        in a stopped state, 2nd message
                                        was issued.
          ...1 ....      FSCFORCE       X'10' Logoff message was issued.
          .... 1...      FSCEXMPT       X'08' User is exempt from the
                                        stop and force actions of the
                                        free storage limit detection
                                        function.
          .... .1..      FSCGRCON       X'04' A 1 minute grace period is
                                        allowed
0018   24 Signed       4 FSCLOCK        This is an informal spin lock.
                                        The lock must be held to update
                                        COUNT, GRACE and FLAGS. Use test
                                        and set to update.
          00000004       FSCSIZE        ((*-FSCBK)+7)/8 FSCBK size in
                                        double-words

FSCBK Storage Layout

          
*** FSCBK - Control Block in FSCBK
*
*     +---------------------------+---------------------------+
*   0 |         FSCVMDBK          |///////////////////////////|
*     +---------------------------+---------------------------+
*   8 |                       FSCGRACE                        |
*     +---------------------------+--------------------+------+
*  10 |         FSCCOUNT          |////////////////////|:FLAG |
*     +---------------------------+--------------------+------+
*  18 |         FSCLOCK           | 1C
*     +---------------------------+
*
*** FSCBK - Control Block in FSCBK

FSCBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
FSCCOUNT       0010
FSCEXMPT       0017 08
FSCFLAG        0017
FSCFORCE       0017 10
FSCGRACE       0008
FSCGRCON       0017 04
FSCLOCK        0018
FSCSIZE        0018 00000004
FSCSTATS       0014
FSCSTOP        0017 20
FSCUSER        0000
FSCVMDBK       0000
FSCWRNG        0017 40